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How Sleep Changes with Age
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Sleep is controlled by Circadian Rhythm and Process S, below is a snippet of how your sleep can be influenced by outside factors

sleep11 pm7 amsleep11 pm7 am7 amTime of dayIncreasingsleep pressureDecreasingsleep pressureClock promoteswakefulnessClock promotessleepProcess SProcess CSleepgateFalling asleepSleepgateFalling asleep☀️Morning lightAffects circadian rhythmBright light soon after wakingresets your body clock and timestonight's melatonin release.☕Morning coffeeAffects Process SCaffeine blocks adenosine, so youstop feeling sleep pressure. Thepressure keeps buildingunderneath.🍽️Regular mealtimesAffects circadian rhythmEating at consistent times keepsthe clocks in your gut and liverin step with your brain.😴Short napAffects Process SA 20 to 30 minute nap drains alittle pressure. Long or latenaps leave too little forbedtime.🏃ExerciseAffects bothRegular exercise supports deepersleep. Doing it consistentlymatters more than the time ofday.🍷Evening alcoholAffects Process SAlcohol can make you drowsy, butas little as two drinks cuts REMsleep later in the night.💡Dim the lightsAffects circadian rhythmBright evening light delaysmelatonin and pushes your clocklater. Dim lights about 3 hoursbefore bed.🛏️Sleep gateAffects bothHigh pressure and a fading wakesignal open your sleep window.Going to bed now makes fallingasleep easier.🌙Dark bedroomAffects circadian rhythmLight at night can suppressmelatonin. Keep your bedroom asdark as you can.🌡️Cool roomAffects circadian rhythmBody temperature reaches its lowpoint in the early morning. Acool bedroom works with thisnatural drop.⏰Same wake timeAffects circadian rhythmWaking at the same time everyday, weekends included, keepsyour rhythm steady.🕒Hours awakeAffects Process SEvery hour you stay awake adds tosleep pressure. That is why sleepcomes faster after a long day.🌤️Daytime outdoorsAffects circadian rhythmDaylight is far brighter thanindoor lighting. Time outsideduring the day strengthens yourrhythm.⚡Afternoon caffeineAffects Process SCoffee needs about 9 hours toclear enough to protect sleep.Energy drinks and pre-workoutsneed even longer.🍝Late heavy dinnerAffects circadian rhythmA big meal close to bedtime sendsa daytime signal to your bodyclocks. Finish eating 2 to 3hours before bed.📱Phone in bedAffects circadian rhythmScreens tend to push bedtimelater, and using your phone inbed is linked to worse sleepquality.🛏️Consistent bedtimeAffects bothYour sleep window opens again.Going to bed at a regular timelets both systems line up nightafter night.💤Deep sleep paybackAffects Process SSleep pressure drains fastestearly in the night. After a shortnight, deep sleep rebounds tocatch up.🌅Getting ready to wakeAffects circadian rhythmYour wake signal starts risingbefore the alarm. Getting lightright after waking locks intomorrow's timing.
Affects Process S (sleep pressure)Affects circadian rhythm (Process C)Affects both

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